Details………………………… HS-6 is a fine spherical propellant that has wide application in pistol and shotshell. In pistol, 9mm, 38 Super, 40 S&W and 10mm Auto are some of the cartridges where HS-6 provides top performance. In shotshell HS-6 yields excellent heavy field loadings in 10 gauge, 12 gauge, 20 gauge, and even the efficient and effective 28 gauge. HS-6 is truly an outstanding spherical propellant. HS-6 is identical to Winchester's discontinued 540.